For a while it sent social media and the football world into a frenzy.
The world's richest man was rumored to be buying Manchester United.
Musk, who is reported to have a net worth of $270 billion according to Forbes, posted on the social networking site that he was buying Manchester United.
The American's message received more than 400,000 likes on the social network.
The new season has been difficult for United.
They are bottom of the league after two losses, and new signings are not coming along.
The Manchester United Supporters Trust said it will demand answers from those running the club after a poor start to the season.
The club has been in decline since Sir Alex Ferguson retired as manager, and people are pointing the finger at the owners.
There have been protests against the Glazers' ownership in the past, including one in May of 2021.
There will be another protest against the American family by United fans.
Some fans welcomed Musk's interest in their club, which was valued at $4.6bn (£3.8bn) by Forbes earlier this year.
Ryan Babel was a former player for the Netherlands and England.
Fans were wondering what a club run by Musk would look like.
The idea of Musk playing football was not going to happen.
Musk, who has more than 103 million followers on the social networking site, later said he was just kidding.
The speculation was not commented upon by United.
When the UK woke up, Musk was asked if he was serious about the bid, and replied that it was a joke. I don't want to buy any sports teams.
Stand-up is my main source of income.
He said that if it were any team, it would be Man U. he was a fan of them as a child.
You don't know what's going to happen.